function ValidarSoloNumeros() {
    if ((event.keyCode < 48) || (event.keyCode > 57))
        event.returnValue = false;
}

function ValidarDecimales() {
    if (event.keyCode < 44 || event.keyCode > 57 || event.ctrlKey || event.keyCode == 47 || event.keyCode == 86 || event.keyCode == 46 || event.keyCode == 45)
        event.returnValue = false;
}

function SoloLectura() {
    if ((event.keyCode < 48) || (event.keyCode > 57)) {
        event.returnValue = false;
    } else {
        event.returnValue = false;
    }

}